KR20020034983A - Release article and adhesive article comprising the release article - Google Patents

Abstract

The present invention relates to a release article comprising a substrate with a release material, the release material comprising a polymer comprising an olefin and an alkyl (meth) acrylate, wherein the polymer comprises (a) an alkyl (meth) acrylate content From about 20 to about 50 weight percent based on the total weight of this release material, the alkyl (meth) acrylates have alkyl groups having from 2 to 30 carbon atoms, or (b) the alkyl (meth) acrylate content is From about 25 to about 50 weight percent, based on the total weight, the alkyl (meth) acrylates have alkyl groups having from 1 to 30 carbon atoms.

Description

RELEASE ARTICLE AND ADHESIVE ARTICLE COMPRISING THE RELEASE ARTICLE}

The release material is particularly useful as cast faces for adhesives and foams, as well as polymer liners for coatings and adhesive articles for paper. One type of commercially available release material contains silicone polymers. However, silicone materials have some drawbacks. The silicone material may migrate to the adhesive to reduce the adhesion efficiency and / or contaminate the final product using the adhesive. This contamination can interfere with the application of the coating, such as paint, or can cause defects in the storage or use of the final product.

There are other known release materials that do not contain silicone. Examples include the release materials disclosed in US Pat. Nos. 4,339,485, 4,425,176, 5,178,924, and 5,167,995.

In the industrial field, there is a continuing study of release materials with good release values, ie low release force (ie low adhesion), in which no adhesive is transferred to the release surface and no release material is transferred to the adhesive. Therefore, the adhesive article using the release material should have consistent adhesive performance even after removing the release material. In addition, the adhesive article should exhibit a non-shocky (ie, smooth and quiet) release when separating the adhesive article from the release article.

The present invention relates to a release article comprising a substrate and a release material, which may be used alone or as part of an adhesive article.

1 is a cross-sectional view of a release article in accordance with one embodiment of the present invention,

2 is a cross sectional view of a release article in accordance with another embodiment of the present invention;

3 is a cross-sectional view of an adhesive article according to one embodiment of the invention,

4 is a cross-sectional view of an adhesive article according to another embodiment of the present invention,

5 is a cross-sectional view of an adhesive article according to another embodiment of the present invention;

6 is a cross-sectional view of an adhesive article according to another embodiment of the present invention.

Detailed description of the invention

Release goods

The release article according to the invention comprises a substrate with a release material and forms a release coated substrate in a variety of articles, such as low adhesion backing for pressure sensitive adhesive (PSA) tapes (eg, rolls of single sided tapes). Can be used to Other articles in which the release material may be used include release liners, labels, wound dressings, and medical grade tapes.

The release article of the present invention exhibits good water solubility for the ink, ie such release material can be printed or written while exhibiting good overall image quality. Also, when removing a tape or label from a release article, a smooth, quiet (ie non-vibratory) release is typically observed. Vibratory release is not only noisy, but also undesirable because visible wrinkles or wrinkles are often formed in the tape or label.

1 shows a release article 10 that can be in the form of a release liner that includes a substrate 12 and a release material 11 thereon. The release material 11 corresponds to the release material of the present invention and may be hot melt coated or solvent coated on the substrate 12. Alternatively, the release material 11 and the substrate 12 can be coextruded using a substrate material such as, for example, polypropylene, polyethylene or polybutylene.

In another embodiment, as shown in FIG. 2, the release article 20 has a first release material 21 on the substrate 22 and a second release material on the substrate 22 opposite the first release material. 25). The second release material 25 may be chemically the same as or different from the first release material 21. One or more of the first release material 21 and the second release material 25 may correspond to the release material of the present invention. If one of the first release material 21 and the second release material 25 does not correspond to the release material of the present invention, the grillless material is a known conventional material such as polyethylene, polypropylene, fluorochemical release material and silicone. May comprise a release material.

The release article may be in the form of a release liner with differential release. In the embodiment shown in FIG. 2, in order to achieve a differential release, the first release material 21 has a different release or adhesion value than the second release material 25, but the two materials may be chemically the same or different. Can be. The release article may be hot melt coated on one side of the substrate 22 with the first release material 21, or solvent coated, followed by hot melt coating on the other side of the substrate 22 with the second release material 25, or It can be prepared by solvent coating. Alternatively, all three layers can be coextruded simultaneously to form a release article.

The thickness of the release material can vary within a very wide range and depends on the application. For example, the coating thickness is from 1 micrometer (μm) to as needed, preferably from 2 to 130 μm, more preferably from 7 to 50 μm, most preferably from 7 to 40 μm. When the release material is oriented after extrusion of the release material to the substrate, the final thickness of the release material can be significantly reduced. The release (ie adhesion) value of the adhesive relative to the release material may vary somewhat depending on the thickness of the release material.

Release material

The release material may include a polymer including olefins and alkyl (meth) acrylates.

Suitable examples of olefins may be ethylene, propylene, butylene, 2-methylpentene, hexene, octene, derivatives thereof, or combinations of olefins or derivatives thereof. Typically, the olefin content ranges from about 50 to about 80 weight percent, preferably from about 55 weight percent to about 75 weight percent, more preferably from about 60 to about 75 weight percent, based on the total weight of the release material. Typically, the melting temperature of olefins is at least 50 ° C., as measured by differential scanning calorimetry (DSC).

Preferably, the polymer has (a) about 20 to about 50 weight percent alkyl (meth) acrylate content based on the total weight of the release material, and the alkyl (meth) acrylate has alkyl groups having 2 to 30 carbon atoms. Or (b) an alkyl (meth) acrylate content is from about 25 to about 50 weight percent based on the total weight of the release material, and the alkyl (meth) acrylate has an alkyl group having from 1 to 30 carbon atoms.

In either case, the alkyl group of the alkyl (meth) acrylate has 4 to 30 carbon atoms, more preferably 4 to 20 carbon atoms. In either case, the alkyl (meth) acrylate content of the polymer is preferably 25 to 45% by weight, more preferably 25 to 40% by weight.

Particularly preferred examples of alkyl (meth) acrylates are n-butyl acrylate and 2-ethylhexyl acrylate. Particularly preferred examples of polymers are ethylene n-butyl acrylate copolymers and ethylene 2-ethylhexyl acrylate copolymers. Exemplary ethylene n-butyl acrylate copolymers are available under the trade names "Lotryl 28BA175", "Lottryl 30BA02", "Lottryl 35BA40", "Lottryl 37BA06" from Elf Atochem, Philadelphia, Pennsylvania, USA; Some are marketed as "Rotryl 40BA200". Exemplary ethylene 2-ethylhexyl acrylate copolymers are those prepared under the tradename “27 2EH120” from Elf Atochem. Suitable examples of derivatives of ethylene alkyl acrylate copolymers are those that are commercially available from acid-modified ethylene methyl acrylates, such as those sold under the trade name "Bynel CXA E214" by DuPont.

Preferably, the polymer is at least about 1 gram / 10 minutes (g / 10 minutes), more preferably 1 to 400 g / 10 minutes, most preferably 1 to 60 g / 10 minutes, as measured by ASTM D1238. It has a melt index or a melt flow rate of. Preferably, the polymer has a density of at least about 0.90 g / cm 3, preferably from 0.91 to 0.96 g / cm 3, more preferably from 0.91 to 0.94 g / cm 3 as measured by ASTM D792-9.

The release material may also contain additives. Examples of additives include ultraviolet absorbers, ultraviolet inhibitors, antioxidants, colorants, fluorescent agents, tracers, antifreeze agents and fillers. Examples of UV absorbers are those sold under the trade names "Tinuvin 325" and "Tinuvin 900" at Ciba Geigy Corporation, New York City, NY, and from Clariant Corporation, Charlotte, NC, USA. Some are marketed as "Sandover VSU". Examples of UV inhibitors are those sold under the trade names "tinuvin 292" and "tinuvin 144" from Ciba Geygi. Examples of antioxidants are those sold under the trade names "Vanox 1320" and "Vanox ODP" by R. T. Vanderbilt Co., Norwalk, CT. Examples of colorants (ie pigments and dyes) are those sold under the trade name "Ti-Pure R-104" by E. I. Dupont de Nemuir & Campani ("Dupont"), Wilmington, Delaware, USA. Examples of fluorescent agents are those sold under the trade name "Uvitex OB" by Ciba Geigy. Examples of anti-caking agents are those marketed under the trade names Siperant 22 "and" Sipherd D17 "at Degusa Corporation, Teterborough, NJ, USA. Examples of fillers are calcium carbonate, eg, Georges, USA. Sold under the trade names "Gamaco" and "Calwhite" in the Georgia Marble Company, Atlanta, Inc., under the trade name Hoover Industrial Minerals, Macon, GA, USA. Sold under the names "Huber 40C" and "Hover 900", and the talc, such as the Pfizer CP 38-33 in the Feature Minerals, Pigment and Metals Division, New York, NY Marketed as ".

The release material may further comprise additional components such as homopolymers, copolymers, terpolymers, or derivatives thereof of olefins or ethylene vinyl acetate, or combinations of homopolymers, copolymers, terpolymers or derivatives thereof. have.

Examples of olefinic additional ingredients include polyethylene, polypropylene and polybutylene, such as high density polyethylene (HDPE), such as those sold under the trade designation "4352N" by Dow Chemical Company ("Dow") in Midland, Michigan, USA. that; Low density polyethylene (LDPE) such as that sold by Dow under the trade name “LDPE 722” (melting index is 8.0 g / 10 min and density is 0.92 g / cm 3); Linear low density polyethylene (LLDPE), such as from the Dow brand name “Dowlex 2244” (melt index is 3.3 g / 10 min, density is 0.92 g / cm 3); Polypropylene, for example from Shell Chemical Company ("Shell") in Houston, Texas, under the trade name "SRD-4-188" (melting flow rate of 5.0 g / 10 min, butylene content of 5%). Commercially available; Polybutylenes such as those sold under the trade name “PB DP-8220” in the shell.

Other examples of olefinic additional components include copolymers of olefins such as ethylene and any of propylene, butylene, hexene or octene; Copolymers of propylene with any of ethylene, butylene, hexene or octene; Or terpolymers of olefins, such as ethylene, butylene and hexene. Terpolymers of ethylene, butylene, and hexene are trade names "Exact 3034" (Exc. 3034) with a melt index of 3.5 g / 10 minutes and a density of 0.902 g / cm3 from Exxon Chemical Company, Houston, Texas, USA Some are commercially available.

Examples of ethylene vinyl acetate-based additional components include those sold under the trade name "Elvax 260" in DuPont, or modified ethylene vinyl acetate copolymers such as DuPont in DuPont. Commercially available as NEL 3101 ".

Base material for release material

In general, the release material of the present invention is used as a release coating for a substrate, which may be, for example, a sheet, fiber or shaped body. One preferred type of substrate is that used for adhesive coated articles (eg, pressure sensitive adhesive coated articles) such as tapes, labels, bandages, and the like. The composition may be applied to at least a portion (typically the entire face) of one or more major faces of a suitably flexible or inflexible substrate material.

Examples of useful flexible substrate materials include paper; Polymers in the form of plastic films, for example polyethylene, polypropylene, polybutylene, polyamide, polyvinyl chloride, polycarbonate, polytetrafluoroethylene, polyester (e.g. polyethylene terephthalate), cellulose acetate; Woven materials such as fabrics formed from natural materials such as synthetic fiber yarns or cotton, or mixtures thereof; Non-woven materials such as nonwoven fibers, such as air-laid webs formed from natural materials such as synthetic fiber yarns or cotton, or mixtures thereof. Useful non-flexible substrates that may be in foil or sheet form include metal, glass and ceramic materials such as aluminum and stainless steel. The primers known in the art can be used to aid in the adhesion of the release coating to the substrate.

When producing an article containing a release coated substrate, such as a tape, the substrate can be selected from a wide range of materials to achieve a support layer for the release material. For example, when the release material is coextruded with the substrate, the substrate typically includes a hot melt processable polymer, such as a thermoplastic polymer. Representative examples of these materials include polyamides (eg, nylon); Polyolefins (eg, polyethylene, polypropylene, polybutylene, poly-4-methylpentene, etc.); polystyrene; Polyester; Copolyesters; Polyvinyl chloride; Polyethylene vinyl acetate; Copolymers (eg, ethylene propylene copolymers, ethylene butylene copolymers, ethylene hexene copolymers, ethylene octene copolymers, propylene butylene copolymers and thermoplastic rubber block copolymers); Polymethyl methacrylate; And mixtures and copolymers thereof. Particularly preferred materials for the substrate are polypropylene, polypropylene mixed with other polyolefins, and copolymers of propylene with alpha olefins in amounts of up to about 50% by weight, for example based on the total weight of the substrate. Preferred materials for the substrate include semicrystalline polypropylenes having a melting point of at least about 150 ° C., semicrystalline polyethylenes having a melting point of at least about 100 ° C. and semicrystalline or amorphous polyesters. Most of the aforementioned polymeric materials are commercially available and can be used without modification. Alternatively, they can be modified in a manner well known to those skilled in the art. For example, the composition for preparing the substrate can be modified with small amounts of conventional modifiers such as colorants (ie pigments, dyes), fluorescent agents, antioxidants and fillers such as zinc oxide, titanium dioxide, calcium carbonate, hydrocarbon resins and the like. .

In the case of extrusion coating the release material onto an existing substrate, the substrate can be selected from the thermoplastic materials listed above. It may also be selected from non-thermoplastic polymers, metals, fabrics, nonwoven webs (polymers and nonpolymers), polymeric foams, ceramics, papers and the like.

If the release material is coextruded with the substrate or extrusion coated onto a substrate made from a polymer, for some applications, the release coating may be extruded before or after forming the release coated oriented substrate or the oriented release coated substrate. It is also desirable to allow the substrate to be oriented in one or more directions. As such, the orientable substrate selected from the aforementioned polymeric materials is a particularly preferred substrate in forming the release article of the present invention. The term "oriented" refers to strengthening the polymer by stretching at a temperature below the crystal melting point of the polymer. For example, suitable polypropylene substrates can be cast extruded polypropylene films, uniaxially oriented polypropylene (MOPP), continuous biaxially oriented polypropylene (BOPP) or coaxial biaxially oriented polypropylene (SBOPP). Suitable polyethylene substrates are, for example, cast extruded high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, uniaxially oriented polyethylene or biaxially oriented polyethylene.

Hot melt processable binding layers can be used to improve the interlayer adhesion between the coextruded release material and the substrate. Suitable examples of binder layers are those sold under the trade names "Daurex 2244" and "LDPE 722" in polyethylene, for example in Dow, and under the trade names "Elbox 250" and "Elbox 4260" in DuPont. And modified ethylene vinyl acetate copolymers (such as Vinel CXA 1123) from DuPont, maleated polypropylene, ethylene acrylic acid and other materials.

Method of making the release article

The release material is preferably hot melt coated onto the substrate using an extruder. In this way, the release material can be directly coated after "in situ" production from the same compartment of the processing apparatus. Alternatively, however, the release material may be coated with a suitable organic solvent (eg, an organic solvent in which the release material may be dissolved), but its release properties may differ from the release properties of the release coating formed by hot melt processing. have. When coating with a solvent, the predetermined concentration of release material in the release coating composition prepared therefrom depends on the coating method and the desired final coating thickness. Typically, the release coating composition is coated with about 1% to about 15% solids.

In the case of solvent-based coatings, the release coating composition can be applied to a suitable substrate by conventional coating techniques such as winding rods, direct gravures, offset gravures, reverse rolls, air knives and trailing blate coatings. The coating may be dried at room temperature, high temperature or a combination thereof, provided that the substrate is able to withstand high temperatures. Typically, the high temperature is about 60 ° C to about 130 ° C. The resulting release coating is a low adhesion backing for a wide range of common pressure sensitive adhesives, such as natural rubber based, acrylic, adhesive block copolymers, poly (alpha) olefins, silicones and other synthetic film formations, elastic materials, for example. Provide an effective release.

The release material may be mixed with one or more additional components as described above when forming the release coating composition. Any suitable method can be used to prepare such mixtures. For example, mixing can be carried out by any method that allows the substantially uniform distribution of additional components in the release material. For example, the polymer of the release material and any additional components may be melt mixed using a twin screw extruder prior to or in situ coating, or the pellets of resin may be dry mixed immediately prior to or in situ. Alternatively, the mixing can be carried out by solvent mixing or any other suitable physical means.

Adhesive goods

The release material can be used with the adhesive article. The adhesive article may comprise an adhesive composition with a release material thereon. One-sided tape can be prepared comprising a substrate having an adhesive layer attached to one side and a release coating on the other side. The tape can be used in a wide range of applications, such as for attaching two sides together (eg, flaps of packing material) or for medical applications (eg wound dressings). As shown in FIG. 3, the adhesive article may further comprise a substrate in the form of a backing, and the release material may be on the side of the substrate opposite the adhesive composition. 3 shows an adhesive article 30, which may be in the form of a tape with a release material 31 that acts as a low adhesion back label (LAB) with a substrate 32, commonly referred to as a backing. The tape may be formed by hot melt or solvent coating the release material 31 on one side of the substrate 32 and then hot melt or solvent coating the adhesive 33 on the other side of the substrate 32. Alternatively, all three layers may be coextruded simultaneously. The tape may be in roll form or pad form.

In the adhesive article 40 as shown in FIG. 4, a release material may be present on the adhesive composition. 4 illustrates an adhesive composition comprising a release article in the form of a differential release liner. The release article is similar to the release article shown in FIG. 2, wherein a first release material 41 corresponding to the release material of the present invention is coated on one side of the substrate 42, and the second release material 45 is It is coated on the other side of the substrate 42. The second release material 45 can be chemically the same as or different from the first release material 41. As described with respect to FIG. 2, one or more of the first release material 41 and the second release material 45 correspond to the release material of the present invention. If one of the first release material 41 and the second release material 45 does not correspond to the release material of the present invention, the release material may be a known conventional material such as polyethylene, polypropylene, fluorochemical release material and silicone. Any of the release materials may be included.

The adhesive article 40 preferably has a differential release. In the embodiment shown in FIG. 4, the first release material 41 has a different release value or adhesion value than the second release material 45 to achieve a differential release, but the two materials may be chemically the same or different. Can be. It is preferred that the first release material 41 adjacent the adhesive 43 has a higher adhesion / release value than the second release material 45. The adhesive 43 may be in the form of an adhesive film or foam.

5 shows an adhesive article 50 comprising a laminated adhesive, with two release liners attached to the laminated adhesive. Each release liner has different release properties. The release material comprising the first substrate 52 with the first release material 51 corresponding to the present invention is laminated to one side of the adhesive 53 and the second substrate 56 with the second release material 55. ) Is laminated to the other side of the adhesive 53. The second release material 55 is chemically the same as or different from the first release material 51. As shown in FIG. 2, one or more of the first release material 51 and the second release material 55 correspond to the release material of the present invention. If one of the first release material 51 and the second release material 55 does not correspond to the release material of the present invention, the release material may be a known conventional material such as polyethylene, polypropylene, fluorochemical release material and silicone. Any of the release materials may be included.

The adhesive article 50 preferably has a differential release. In the embodiment shown in FIG. 5, although the first release material 51 may be chemically the same or different from the second release material 55 to achieve a differential release, the two materials may have different release values or adhesions. Has a value. It is preferred that the first release material 51 adjacent the adhesive 53 has a higher adhesion / release value than the second release material 55. Typically, in use, the adhesive is applied to an object by removing the release material 55 with the substrate 56, which acts as a release liner. The release material 51 with the substrate 52, which then acts as a release liner, is removed to apply another object to the exposed adhesive.

6 illustrates an adhesive article 60, which may be in the form of a tape or label with a release material acting as a release liner. The release material 61 and the first substrate 62, which can act as a release liner, are bonded to an adhesive article that includes an adhesive 63 on the second substrate 66. Generally, the adhesive article is formed by coating the adhesive 63 on the second substrate 66 and then laminating the adhesive 63 to the release material 61 on the first substrate 62. When the adhesive article of FIG. 6 is a label, the adhesive 63 and the second substrate 66 are commonly referred to as facestocks. The mark is formed by die cutting the release material 61 of the release liner from the adhesive 63 of the facestock.

The release material used with the adhesive article may have a substrate as described above, which may be the same or different than the substrate having the adhesive composition.

The adhesion value or release value as described above refers to the adhesion or release between the release material and the adhesive. For the purposes of the present invention, test method C ("Peel Adhesion of Pressure Sensitive Tape at 180 ° Angle" of ASTM D3330-90 at Peeling Rate of 228.6 cm / min; Examples 1-11 and Comparative Examples 1-13) Preferred adhesion value or release value, as measured by using the following description), is from 0 to about 200 g / 2.5 cm, preferably 5 to 150 g / 2.5 cm, more preferably 5 to 100 g / 2.5 cm. Most preferably in the range from 5 to 70 g / 2.5 cm.

When producing an adhesive article comprising the release material of the present invention, any suitable adhesive composition can be used. Adhesives useful for making articles containing the release materials of the present invention include hot melt coated formulations, transfer coated formulations, solvent coated formulations, latex formulations, as well as lamination, thermally active and water active adhesives. Examples of preferred adhesives are acrylate-based adhesives and fluorochemical adhesives. The adhesive may also contain additives such as plasticizers, fillers, antioxidants, stabilizers, pigments, diffusion particles, tacky resins, hydrocarbon oils, curing agents and solvents.

Preferred adhesives of the present invention may include pressure sensitive adhesives. Usually, the pressure-sensitive adhesive is tacky at room temperature and can be adhered to the surface by applying a light degree of acupressure at most. General descriptions of useful pressure sensitive adhesives are described in Encyclopedia of Polymer Science and Engineering , Vol. 13, Wiley-Interscience Publishers (New York, 1988). Another description of useful pressure sensitive adhesives is described in Encyclopedia of Polymer Science and Technology , Vol. 1, Interscience Publishers (New York, 1964).

The adhesive composition of the adhesive article preferably has a polar content of about 0 to about 25%, preferably 0 to 20%, more preferably 0 to 15%, most preferably 2 to 10% by weight of the adhesive. Do.

The adhesive composition used in the present invention may be extrudable, for example co-extruded with the release material and the substrate during tape formation. These may be crosslinked after application as necessary. Although the adhesive is preferably applied by an extrusion technique, the adhesive may be applied by various other techniques.

Suitable substrates for the adhesive article may be the same or different than those used for the release article, for example polyethylene, polypropylene, nylon, polycarbonate, polyvinyl chloride, polyester, as well as woven or nonwoven webs.

Although the present invention is illustrated by the following examples, it is not intended to unduly limit the invention to the specific materials and amounts recited in these examples, as well as other conditions and details. All percentages and ratios throughout the examples are by weight and weight ratio unless otherwise noted. All example numbers with "C-" in front of the numerals are comparative examples, and all example numbers with "E-" in front of the numerals are examples corresponding to the present invention.

Summary of the Invention

The present invention relates to a release article comprising a substrate with a release material. Release materials include polymers comprising olefins and alkyl (meth) acrylates, ie alkyl acrylates or alkyl methacrylates. The term "alkyl (meth) acrylate" is used throughout this specification to refer to alkyl acrylates or alkyl methacrylates. For the purposes of the present invention, the term "polymer" for polymers comprising olefins and alkyl (meth) acrylates refers to copolymers or terpolymers of olefins and alkyl (meth) acrylates; Any derivative of these copolymers or terpolymers; Or any combination of these copolymers, terpolymers or derivatives thereof. The polymer has (a) an alkyl (meth) acrylate content of about 20 to about 50 weight percent based on the total weight of the release material and the alkyl (meth) acrylate has an alkyl group having 2 to 30 carbon atoms, or (b A) alkyl (meth) acrylate content is from about 25 to about 50 weight percent based on the total weight of the release material and the alkyl (meth) acrylate has alkyl groups having from 1 to 30 carbon atoms.

Another release article of the invention comprises a substrate having opposing first and second major surfaces, the first major surface having a first release material thereon and the second major surface having a second release material thereon. . The first release material comprises a polymer comprising olefins and alkyl (meth) acrylates. The polymer has (a) an alkyl (meth) acrylate content of about 20 to about 50 weight percent based on the total weight of the release material and the alkyl (meth) acrylate has an alkyl group having 2 to 30 carbon atoms, or (b A) alkyl (meth) acrylate content is from about 25 to about 50 weight percent based on the total weight of the release material and the alkyl (meth) acrylate has alkyl groups having from 1 to 30 carbon atoms.

In another embodiment, the present invention is directed to an adhesive article. The adhesive article includes an adhesive composition with a release material. Release materials include polymers including olefins and alkyl (meth) acrylates. The polymer has (a) an alkyl (meth) acrylate content of about 20 to about 50 weight percent based on the total weight of the release material and the alkyl (meth) acrylate has an alkyl group having 2 to 30 carbon atoms, or (b A) alkyl (meth) acrylate content is from about 25 to about 50 weight percent based on the total weight of the release material and the alkyl (meth) acrylate has alkyl groups having from 1 to 30 carbon atoms.

The present invention also relates to an adhesive article comprising a substrate having an adhesive composition. Release materials include polymers including olefins and alkyl (meth) acrylates. The polymer has (a) an alkyl (meth) acrylate content of about 20 to about 50 weight percent based on the total weight of the release material and the alkyl (meth) acrylate has an alkyl group having 2 to 30 carbon atoms, or (b A) alkyl (meth) acrylate content is from about 25 to about 50 weight percent based on the total weight of the release material and the alkyl (meth) acrylate has alkyl groups having from 1 to 30 carbon atoms.

The present invention may also include an adhesive article comprising an adhesive composition on one major face and a substrate having a release material on the opposite major face. Release materials include polymers including olefins and alkyl (meth) acrylates. The polymer has (a) an alkyl (meth) acrylate content of about 20 to about 50 weight percent based on the total weight of the release material and the alkyl (meth) acrylate has an alkyl group having 2 to 30 carbon atoms, or (b A) alkyl (meth) acrylate content is from about 25 to about 50 weight percent based on the total weight of the release material and the alkyl (meth) acrylate has alkyl groups having from 1 to 30 carbon atoms.

Resin for Release Material

In Table I, resins A-M and O-X were purchased as pellets from a vendor. Resin N was obtained by melt-mixing the pellets of the resin P and the resin M in 40:60 weight% ratio. Resins A to R are copolymers of ethylene and alkyl acrylates. Components of Resins A-E, H-J, L, M, O-Q and V-W, as well as N, were purchased from Elf Atochem, North America Inc., Philadelphia, Pennsylvania, USA. Resins F and G were purchased from Union Carbide Corporation, Danbury, Connecticut. Resins S and T were purchased from Dow Chemical Company, Midland, Michigan, USA. Resin U was purchased from Exxon Chemical Company, Houston, Texas. Resin R is from Elf Atochem. The trade name of the resin is shown in Table I.

In Table I, the melt index (MI) was obtained from each vendor's instructions and measured in g / 10 min according to ASTM D1238. In Table I, the density was measured in g / cm 3 in accordance with ASTM D792-9.

Suzy Trade name Composition of resin Alkyl acrylate type: Content (% by weight) MI density A Lotryl 9ma02 Copolymer of ethylene and methyl acrylate Methyl: 9.5 2.2 0.928 B Lotryl 15MA03 Copolymer of ethylene and methyl acrylate Methyl: 14.5 2.8 - C Lotryl 20MA08 Copolymer of ethylene and methyl acrylate Methyl: 20.5 8 - D Lotryl 28MA07 Copolymer of ethylene and methyl acrylate Methyl: 28 7 - E Lotryl 35ma05 Copolymer of ethylene and methyl acrylate Methyl: 35 5 0.959 F DPDA6182 Copolymer of ethylene and ethyl acrylate Ethyl: 15 15 - G DPD6169 Copolymer of ethylene and ethyl acrylate Ethyl: 18 6 - H Lotader 4720 Terpolymer of ethylene, 30% ethyl acrylate and 0.8% maleic anhydride Ethyl: 30 30 - I Lotryl 7ba01 Copolymer of ethylene and n-butyl acrylate n-butyl: 7 1.4 0.918 J Lotryl 17ba04 Copolymer of ethylene and n-butyl acrylate n-butyl: 17.5 4.0 0.925 K DS3054-70 Copolymer of ethylene and n-butyl acrylate n-butyl: 20.0 6.0 - L Lotryl 28ba175 Copolymer of ethylene and n-butyl acrylate n-butyl: 28 175.0 - M Lotryl 30ba02 Copolymer of ethylene and n-butyl acrylate n-butyl: 30 2 0.928 N 40% Lotryl 37BA06 / 60% Lotryl 30BA02 Copolymer of ethylene and n-butyl acrylate n-butyl: 32.8 3.6 - O Lotryl 35ba40 Copolymer of ethylene and n-butyl acrylate n-butyl: 35 40 0.925 P Lotryl 37ba06 Copolymer of ethylene and n-butyl acrylate n-butyl: 37 6.0 - Q Lotryl 40ba200 Copolymer of ethylene and n-butyl acrylate n-butyl: 40 200 - R 27 2EH120 Copolymer of ethylene and 2-ethylhexyl acrylate 2-ethylhexyl: 27 120 - S LDPE 5351 Low density polyethylene None: 0 1.9 0.926 T HDPE 4352N High density polyethylene None: 0 4 0.952 U Exact 3027 Ethylene-butene Copolymer Containing 14% Butene None: 0 3.5 0.900 V Evatane 33-25 Polyethylene Vinyl Acetate, 33% Vinyl Acetate Content None: 0 ^ - W Evatane 40-55 Polyethylene Vinyl Acetate, 40% Vinyl Acetate Content None: 0 ^ - X PB DP-8220 Polybutylene None: 0 2.0 0.897

-= Resin not tested for density

^ = Melt index value not available from seller

Examples 1-11 and Comparative Examples 1-13

The adhesive articles identified in Table II as Examples 1-11 and Comparative Examples 1-13 were prepared using release articles made from Resins A-X as indicated in Table II as release materials. The substrate was a two-layer film composite consisting of a 7.6 micron thick polyethylene vinyl acetate (EVA) layer and a 14.2 micron thick polyester layer, and is a trade name of Minnesota Mining and Manufacturing Company (3M), St. Paul, Minn. "SCOTCHPAK 135" was obtained. Each release article was prepared by independently extruding a 38 micron thick layer of resins A-X as shown in Table I to the EVA side of "SCOTCHPAK 135". For Examples E-2, E-5, and E-7, the extruders used were Hake Rheocord, commercially available from Haak Inc., Saddle Brook, NJ, and the extrusion temperature profile was zoned. 1 = 60 ° C .; Zone 2 = 99 ° C .; Zone 3 = 138 ° C .; And die temperature = 138 ° C. For all other examples and comparative examples in Table II, the extruder used was a Hark Leocord commercially available from Hark Incorporated, Saddle Brook, NJ, and the extrusion temperature profile was zone 1 = 60 ° C .; Zone 2 = 118 ° C .; Zone 3 = 177 ° C .; And die temperature = 177 ° C.

Eight adhesive tape samples were laminated to the release material of each of the manufactured release articles to prepare an adhesive article, four samples being brand name "Scotch Brand Number 850 Silver Polyester Film Tape" (Tape # 850) and the other four samples The trade name was "3M 8439 Ultra Low Gas Release High Shear Polyester Tape" (tape # 8439), all obtained from 3M. Each tape sample was 2.54 cm wide and 25.4 cm long, and after placing the tape sample on the release article, a WG laminator (serial number MDS001049WG; Warman International, Inc., Madison, WI) was used. The tape samples were laminated by laminating them to the release article at a pressure of 1.8 kg / cm. Each obtained adhesive article comprising eight tape samples was aged at 70 ° C. and 90% relative humidity (RH) for three days, with each adhesive article comprising the tape sample removed from the heated relative humidity chamber. And left at room temperature and 50% RH for 2 hours. Each tape sample was then removed from the release article using Test Method C ("Peel Adhesion of Pressure Sensitive Tape at 180 ° Angle") of ASTM D3330-90 at a peel rate of 228.6 cm / min. The results for each adhesive article are described in Table II and are the average of four tests for tape # 850 and tape # 8439, respectively.

In addition, each adhesive article was evaluated for vibration by observing the tape visually and visually (visually) when the viewer removed the tape from the release article at a distance of about 25-30 cm from the sample. The adhesive article is rated "yes" for vibrancy when removing the tape sample, when it is noisy (ie, squeaky), or when there is visible wrinkles on the tape while the tape is removed from the adhesive article, or both. Ranked. The adhesive article was rated "no" when removing the tape sample, ie smooth (i.e., smooth) and when no wrinkles were visually observed on the tape while removing the tape from the release article. The results are described in Table II.

The data in Table II showed that the adhesive article examples representing the present invention had good adhesion values (ie, low adhesion values and non-vibration release) with one or more tape structures.

Adhesive article number Composition of Release Material (Resin of Table I) Adhesion Result w / Tape # 850 Adhesion Result w / Tape # 8439 Value (g / 2.5 cm) Vibrating Value (g / 2.5 cm) Vibrating E-1 K 143.4 no 223.6 no E-2 L 37.4 no 198.1 no E-3 M 31.8 no 140.5 no E-4 N 48.0 no 51.3 no E-5 O 38.1 no 24.4 no E-6 P 39.8 no 38.2 no E-7 Q 178.2 * no 39.0 no E-8 R --- no 24.8 no E-9 D 237.7 no 189.6 no E-10 E 350.9 no 113.9 no E-11 H 401.9 no 79.2 no C-1 A 220.7 no 311.3 no C-2 B 410.4 no 483.9 no C-3 C 458.5 no 467.0 no C-4 F 656.6 no 503.7 no C-5 G 357.5 Yes 571.7 no C-6 I 263.2 no 410.4 no C-7 J 200.9 no 300.0 no C-8 S 130.8 Yes 373.6 Yes C-9 T 301.4 Yes 510.9 Yes C-10 U 88.3 Yes 232.1 Yes C-11 V 367.9 no 167.0 no C-12 W 894.3 no 146.2 no C-13 X 93.4 Yes 280.2 Yes

* = Sample may be contaminated.

--- = Do not test the sample.

Examples 12-17 and Comparative Examples 14-15

Resin P of Table I in pellet form was melt mixed independently of Resin T or Resin X of Table I in various weight ratios. The resulting mixed resin was independently lifted up as a 38 micron thick layer with a "SCOTCHPAK 135 film" as described in Examples 1-11 and Comparative Examples 1-13. The extruder was a Hark Leocord commercially available from Hark Incorporated, Saddle Brook, NJ, with an extrusion temperature profile of Zone 1 = 60 ° C .; Zone 2 = 118 ° C .; Zone 3 = 177 ° C .; And die temperature = 177 ° C. Tape samples of Tape # 850 and Tape # 8439 were laminated to the release materials of the prepared release articles, respectively, and aged, and evaluated as described in Examples 1-11 and Comparative Examples 1-13. The results for each adhesive article are described in Table III and represent the average of four tape tests for each of Tape # 850 and Tape # 8439.

The data in Table III show the relatively high adhesion values as well as the vibratory release of the release articles of high density polyethylene and polybutylene (Comparative Examples C-14 and C-15). However, when high density polyethylene and polybutylene are mixed independently with the copolymer of ethylene and n-butylene of the present invention (resin P of Table I), a decrease in adhesion value and smooth release is observed.

Adhesive Item Number Composition of Release Material (Resin of Table I; Weight Ratio) Alkyl acrylate (% by weight) of polyethylene n-butyl acrylate Adhesion Result w / Tape # 850 Adhesion Result w / Tape # 8439 Value (g / 2.5 cm) Vibrating Value (g / 2.5 cm) Vibrating E-12 P: T; 35:65 37 88.6 no 534.9 no E-13 P: T; 50:50 37 50.2 no 249.0 no E-14 P: T; 65:35 37 48.8 no 57.1 no E-15 P: T; 80:20 37 51.3 no 65.2 no E-16 P: X; 65:30 37 67.6 no 246.2 no E-17 P: X; 80:20 37 54.4 no 135.0 no C-14 T 0 301.4 Yes 510.0 Yes C-15 X 0 93.4 Yes 280.2 Yes

Claims (24)

A release article comprising a substrate with a release material, the release material comprising a polymer comprising an olefin and an alkyl (meth) acrylate, wherein the polymer comprises (a) an alkyl (meth) acrylate content of the total of the release material. From about 20 to about 50 weight percent by weight, the alkyl (meth) acrylates have alkyl groups having from 2 to 30 carbon atoms, or (b) the alkyl (meth) acrylate content is based on the total weight of the release material From about 25 to about 50 weight percent, wherein the alkyl (meth) acrylate has an alkyl group having from 1 to 30 carbon atoms. An adhesive article comprising an adhesive composition with a release material, the release material comprising a polymer comprising an olefin and an alkyl (meth) acrylate, wherein the polymer comprises (a) an alkyl (meth) acrylate content of the release material. From about 20 to about 50 weight percent based on total weight and the alkyl (meth) acrylates have alkyl groups having from 2 to 30 carbon atoms, or (b) the alkyl (meth) acrylate content is based on the total weight of the release material And from about 25 to about 50 weight percent, wherein the alkyl (meth) acrylate has an alkyl group having 1 to 30 carbon atoms. A release material comprising a substrate having opposing first and second major surfaces, the first major surface having a first release material thereon, the second major surface having a second release material thereon, and the first The release material comprises a polymer comprising an olefin and an alkyl (meth) acrylate, wherein the polymer has (a) an alkyl (meth) acrylate content of about 20 to about 50 weight percent based on the total weight of the release material, Alkyl (meth) acrylates have alkyl groups of 2 to 30 carbon atoms, or (b) the alkyl (meth) acrylate content is about 25 to about 50 weight percent based on the total weight of the release material, and the alkyl (meth) The acrylate has an alkyl group having 1 to 30 carbon atoms. An adhesive article comprising a substrate with an adhesive composition, the adhesive composition having a release material thereon, the release material comprising a polymer comprising an olefin and an alkyl (meth) acrylate, wherein the polymer is (a) alkyl The (meth) acrylate content is from about 20 to about 50 weight percent based on the total weight of the release material and the alkyl (meth) acrylate has an alkyl group having from 2 to 30 carbon atoms, or (b) an alkyl (meth) acrylic And the rate content is from about 25 to about 50 weight percent based on the total weight of the release material and the alkyl (meth) acrylates have alkyl groups having from 1 to 30 carbon atoms. An adhesive article comprising an adhesive composition on one major face and a substrate having a release material on an opposing major face, the release material comprising a polymer comprising an olefin and an alkyl (meth) acrylate, the polymer comprising (a) The alkyl (meth) acrylate content is about 20 to about 50 weight percent based on the total weight of the release material and the alkyl (meth) acrylate has an alkyl group having 2 to 30 carbon atoms, or (b) alkyl (meth) And the acrylate content is from about 25 to about 50 weight percent based on the total weight of the release material and the alkyl (meth) acrylates have alkyl groups having from 1 to 30 carbon atoms. The release article of claim 1, wherein the release material further comprises additional components including homopolymers, copolymers, terpolymers or derivatives thereof, or combinations thereof of olefins or ethylene vinyl acetate. The process of claim 6, wherein the additional component is a copolymer of ethylene with any of propylene, butylene, hexene or octene; Copolymers of propylene with any of ethylene, butylene, hexene or octene; Or terpolymers of ethylene, butylene and hexene. The release article of claim 1 wherein the alkyl group of the alkyl (meth) acrylate of the polymer has 4 to 30 carbon atoms. The release article of claim 1 wherein the alkyl group of the alkyl (meth) acrylate of the polymer has 4 to 20 carbon atoms. The release article of claim 1 wherein the alkyl (meth) acrylate content of the polymer ranges from 25 to 45 weight percent based on the total weight of the release material. The release article of claim 1 wherein the alkyl (meth) acrylate content of the polymer ranges from 25 to 40 weight percent based on the total weight of the release material. The release article of claim 1 wherein the polymer has a melt index of at least about 1 g / 10 min. The release article of claim 1 wherein the polymer has a melt index of 1 to 400 g / 10 min. The release article of claim 1 wherein the polymer has a melt index of 1 to 60 g / 10 min. The release article of claim 1 wherein the polymer has a density of at least about 0.90 g / cm 3. The release article of claim 1 wherein the polymer has a density of 0.91 to 0.96 g / cm 3. The release article of claim 1 wherein the polymer has a density of 0.91 to 0.94 g / cm 3. The release article of claim 1 wherein the olefin comprises ethylene, propylene, butylene, 2-methylpentene, hexene, octene, derivatives thereof, or a combination thereof. The release article of claim 1 wherein the substrate comprises paper, polymer, woven material, nonwoven material, metal, glass, or ceramic material. 20. The release article of claim 19 wherein the polymer comprises polyethylene, polypropylene, polybutylene, polyamide, polyvinyl chloride, polycarbonate, polytetrafluoroethylene, polyester or cellulose acetate. The adhesive article of claim 2 wherein the release material has a substrate that can be the same or different than the substrate having the adhesive composition. The adhesive article of claim 2, wherein the adhesive composition has a polar content in the range of about 0 to about 25% based on the total weight of the adhesive composition. The adhesive article of claim 2 wherein the adhesive composition comprises an acrylic adhesive or a fluorochemical adhesive. The adhesive article of claim 2 wherein the adhesive composition comprises a pressure sensitive adhesive.